Device comprising a valve for injecting slurry around a tubular post embedded in the ground

摘要

The invention relates to a non-return valve of small thickness allowing the repeated injection of slurry round the outside of a tubular post whilst preventing the material surrounding the post from being able to take the reverse path. …??This valve 1, which can be placed substantially within the thickness of the wall of the post 4 consists of an elastic tubular flap 10 which is secured to the body of the valve 1 at one of its ends 11 and which rests on a cylindrical bearing surface 9 situated at the centre, a surface 9 which is equipped with orifices 7 corresponding with the inside of the post, the elastic tubular flap 10 being surrounded by an elastic ring 12 which is more easy to compress and deforms by variation of its thickness when slurry is sent under pressure via the aforementioned orifices 7, the slurry which flows round the outside of the post flowing between the cylindrical bearing surface 9 and the inside of the elastic tubular flap 10, and the elastic ring 12 surrounding the tubular flap 10 contributing to pushing the latter back against the cylindrical bearing surface as soon as the injection of the slurry is stopped, and resuming its shape such that no quantity of slurry remains within the valve. …IMAGE…